对结构向量进行排序 - 按字典顺序

Question

我（Rust 的新手）正在尝试在 Rust 中对结构向量进行排序（首先按 X 坐标，然后按 Y 坐标）。下面的 MWE 沿着 'X' 进行排序，我如何包括沿着 'Y' 的排序？

期望的结果 -> [(0.0,0.0), (0.0,2.0), (2.0,0.0), (2.0,2.0)]

非常感谢您的帮助。谢谢！

#![allow(unused)]

use std::cmp::Ordering;

#[derive(Debug)]
struct Point {
    x: f64,
    y: f64
}

impl PartialOrd for Point {
    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
        self.x.partial_cmp(&other.x)
    }
}

impl PartialEq for Point {
    fn eq(&self, other: &Self) -> bool {
        self.x == other.x
    }
}

fn main() {
    let p1 = Point { x: 0.0, y: 0.0 };
    let p2 = Point { x: 2.0, y: 0.0 };
    let p3 = Point { x: 2.0, y: 2.0 };
    let p4 = Point { x: 0.0, y: 2.0 };

    let mut pts = vec![];
    pts.push(p1);
    pts.push(p2);
    pts.push(p3);
    pts.push(p4);
    
    pts.sort_by(|a, b| b.x.partial_cmp(&a.x).unwrap());
    println!("{:?}",pts); // -> [(2.0,0.0), (2.0,2.0), (0.0,0.0), (0.0,2.0)]
  
}

Answer 1

使用元组进行比较：

pts.sort_by(|a, b| (a.x, a.y).partial_cmp(&(b.x, b.y)).unwrap());

Playground

对结构向量进行排序 - 按字典顺序

Sort a vector of structs - Lexicographically

sorting

struct

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